Reproducer



sep@

H. M. ALARSCN REPRODUGER Filed April 16, 1927 2 sheets-sheer 1 PatentedSept. 11, 1928.

' UNITED STATES HILDA M. LARSON, F TACOMA, WASHINGTON.

'.REIPRODUCER.

Application led April 16, 1927. Serial No. 184,368.

This invention aims to provide novel reproducing mechanism adapted tocarry the needle which cooperates with a phonograph disk.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the inventionappertains.

With the above and other objects in view 1o which will appear as thedescription proceeds, the invention resides in the combination andarrangement of part-s and in the details of construction hereinaftervdescibed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made withinthescope of what is claimed, without departing from'the spirit of theinvention. In the drawings Figure 1v shows in elevation, a .cabinetwherein the device forming the sub-jectmatter of this application hasbeen embodied, parts being in section;I Figure 2 is a diagrammatic planshowing A how the device hereinafter describedmay be installed;

Figure 3 is a vertical sectional view taken through the cabinet and the'horn;

Figure 4 is a side elevation showing the y device constructed inaccordance with the invention; y

Figure 5 is an elevation of the structure shown in Figure 4;

Figure 6 is a plan showing a modification; Figure 7 is an elevationofthe structure shown in Figure 6.

If desired, the invention maybe used with ay cabinet 1 wherein a table 2is ]our naled, the table being adapted to carry a record disk 3, means 4being" supplied for rotating the., table 2. In the cabinet 1 1 s locateda horn 5 or its equivalent, an amplifying means being shown at 6 andbeing connected by conductors 14 with a battery 7. A reproducer 8 ismounted on the horn 5. A tone arm 9 is mounted at 10 for'horizontalswinging movement and has an extension 11 that is pivotally mounted at12 to swing vertically. The device hereinafter described may be usedwith such a mechanism as that hereinbefore set forth, but I do not bindmyself to use the construction which I have described. j

In carrying out theinvention as shown in -Fi re 4, there is .provided aframe 15,

'which is 'a composite structure, including an angle bracket 16 having amain flange 17 and an auxiliary ange 18 disposed at right angles tothe-main flange 17. The numeral 19 marks a sleeve, the forward end ofwhich is cut off at a bevel, as shown at 20. In the side of the sleeve19 there is a set screw 21, and on the lower forward part of the sleeve19 there is an abutment lug 22. A permanent magnet ,23 is disposedagainst. the ilange 17 of the angle bracket-16, and the outer surface ofthe magnet 23 vis engaged by a retainer plate 24 through which passes asecuring element 25, such as a bolt', the bolt extending backwardlythrough the flange 17, through the bottom portion of the sleeve 19, andthrough the abutment lug 22, a nut 26 on the bolt 25 bearing against thelug 22. Coils 27 are mounted on the poles of the magnet23 and areconnected by a conductor 28. The coils 27 are connected at 29 toconductors 30 which extend backwardly through the sleeve 19 and throughlthe tone arm 9 Yto the amplifying means 6. A rib 31, 1n the form of aplate, is secured to the flange 17 of the angle bracket' 16 and' isprovided at its lower end with a bearing 32 in which is pivoted at33intermediate its ends, an armature 34 adapted to cooperate with thepoles of the magnet 23, the armature being supplied intermediate itsends with a holder 35 operating in an opening 36 in the flange 18 of theangle bracket 16, the holder being adapted to retain a needle 37 whichfollows the sound groove ofthe rec' ord 3 on the table 2. The movementof the armature34 is limited by adjustable stops 38, such as screwsthreaded into the flange 18 of the angle bracket 16.

The ygroove of the record 3 receives the needle 37, the armature 34moves with respect to the poles of the vmagnet 23, and the current flowthrough the conductor 30 'lluctuates in a way well understood by thoseskilled in the art, the amplifying means 6, the reproducer 8 and thehorn 5 exercising their usual functions.

In carrying outr the invention as shown in Figure 6 there is provided aframe 15a which is a composite structure including an angle bracket 16ahaving a main flange 17EL and an auxiliary flange 18a disposed at rightangles to the main flange 17a. The numeral 19EL marks a sleeve, theforward end of which is connected at 39 to an abutment strip 40. In theside of the sleeve 19a there is a s'et scr'ew 21a. A permanent ma'gnet23a is disposedA againstthe `iiange' 17Y of the angle bracket 16, andtheouter surface of the magnet 23a is en aged by a retainerl plate 24through whic passes a securin on the bolt 25 earing against the abutmentstrip 10.` 'Coils 27a are mounted on the poles of the magnet '23a' and'are connected electrically as hereinbefore described, 4and as shown inFigure 5. A rib 31a, in the" L form of a plate, is secured to the flange17? of the .angle bracket 16, and is vprovided at itsx end with abearing 321 in which is pivoted at 33, intermediateits ends, anarmature34 adapted to `cooperate with thev poles of the magnet 23, the armaturebeing supplied-intermediate its ends with` an angular holder '35operating inv an ropening in the flange 18 of the angle bracket 16a, the

f holder being adapted to retain a, needle 37a which follows the soundgrooveof the record as herebefore described. v i

Generally stated, the form depicted in Figures 7 and 6 does not dider.in operation from .the form shown in Figures t and 5, the armature 34,being limited in its move: ment by the adjustable stops 38, the sleeve19a being held by the set screw 21on the pivoted extension llof'the,tone 'arm 9, and the sleeve '.19 being 1. In a device ot"l thev classdescribed, a

l sleeve' provided with an abutment, an angle iianges,f ai' magnetdisposed against the main flange,-a retainer cooperating with themagnet, a securing element passing through the retainer, the'main angevand the magnet, and engaging the abutment, coils en the by the;auxiliaryelement 25,.such as a bolt, the bolt exten ing backwardlythrough the Bange 17'1t and] through the butment strip 40, a, nut 26n fVthe' magnet, a securing element engagng the similarly held in place` yxture beingA supplied intermediate itsends r Losetas' Of theimagnet, anarmature pivoted intermediate its ends and cooperating with-`being'supplied withaneedle holder.

' 2. Inadevice ofthe class described, Aan

[angle'braeket'comprisinga main Iiange and an auxiliary ange, amagnetcooperating with the' mainiiange, a. retainer engaging retainer and-fthemain flange tobin the magnet'between the retainer and the main iange',c'ils on the poles of the magnet, an 'i armature," a A needle holdercarried by the armature, meansk for mounting the armature vpivotally,intermediate its ends, in operative `relation to` the .poles of themagnet, and' means carried by the auxiliary vflange of they anglebracket for limiting the movement of the armature.

3. In a device of the class described, a supporting member, a magnetdisposed against the supporting member,- a A'retainer engaging themagnet, a securing element engaged with the retainer and withfthesupporting member and. binding lthe -magnet therea-gainst, coils von thepoles of the magnet,` a bearing on the' supporting member, g

an armature cooperating with the poles of .the magnet' and mountedpivotally intermediate its ends on the bearing, the armawith a needleolder, and means movable in the supporting member on each side of theneedle holder for .engaging the ends of f., ninna M. LARsoN asl

